ELECTROCHEMICAL ELEMENT, METHOD FOR MANUFACTURING SAME, AND ELECTROCHEMICAL DEVICE

An electrochemical element includes a current collector, and an active material layer supported on the current collector, wherein the active material layer includes active material particles, the active material particles each include lithium silicate composite particles each including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase, and a first coating that covers at least a portion of a surface of the lithium silicate composite particles, the first coating includes an oxide of a first element other than a non-metal element, the active material layer has a thickness TA, and T1b > T1t is satisfied, where T1b is a thickness of the first coating that covers the lithium silicate composite particles at a position of 0.25TA from the surface of the current collector in the active material layer, and T1t is a thickness of the first coating that covers the lithium silicate composite particles at a position of 0.75TA from the surface of the current collector in the active material layer.